The U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives sent an alert to federally licensed firearms dealers a day after the shooting seeking information related to any gun purchases by Michelle Jacqueline Zajko.

The woman accused of killing U.S. Border Agent David Maland allegedly used a gun bought by someone who was a person of interest in a double murder, prosecutors said.

A criminal complaint filed in federal court accuses Teresa Youngblut of assault as Agent David Maland's casket brought to Colonie for flight home to Minnesota.

Law enforcement agencies in several states are reportedly searching for a woman believed to have supplied guns used in the fatal shooting of a Border Patrol agent last week.

A United States Border Patrol agent was gunned down during a traffic stop in Vermont near the Canadian border, officials have confirmed. It happened around 3:15 p.m. Monday on Interstate 91 in Coventry, 20 miles from the Northern border, according to the Department of Homeland Security.

The FBI said Friday that it arrested a Washington state woman in the fatal shooting of a U.S. Border Patrol agent in Vermont this week and identified the German man who was killed.

Police records show that law enforcement officials are searching for a 32-year-old woman related to the purchase of the firearms allegedly used in the killing of Border Patrol agent David Maland.

A U.S. Border Patrol agent was fatally shot Monday afternoon in Vermont, state police said. Federal authorities are investigating.

Federal prosecutors said in a court filing that the investigation into a Border Patrol agent's shooting death has revealed a connection to Delaware County, Pa.

Court documents obtained by NBC5 identify the suspect accused of shooting and killing Border Patrol Agent David Maland.

Teresa Youngblut, 21, has been charged in the killing of Vermont-based Border Patrol Agent David Maland, which occurred on Monday.